Groundwater in Anne Arundel County, Maryland

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1 Groundwater in Anne Arundel County, Maryland Presented to Fort George G. Meade Restoration Advisory Board March 15, 2012 David W. Bolton Maryland Geological Survey

2 Physiographic Provinces and Aquifer Types in Maryland limestone Baltimore sand & gravel Wash. D.C. fractured rock

3 Coastal Plain Groundwater Characteristics Unconsolidated sediments Confined aquifers Fall Line Usually high well yields Chesapeake Bay Surficial Aquifer Columbia Atlantic Ocean Consolidated Rock Not to scale

4 The Hydrologic Cycle and Water Budget Average Water Budget (inches)

5 Groundwater Flow System

6 Groundwater System

7 A Geology of Anne Arundel County B

8 Characteristics of Major Aquifers in Anne Arundel County Aquifer Description Depositional Environment Water Quality Reported withdrawals in 2010 Aquia Quartz sand, shells, glauconite Marine Iron, Manganese (some local issues) 0.2 mgd Magothy White/gray/clear quartz, interbedded with black and gray clay, lignite Fluvial/ marine 1.6 mgd Upper and Lower Patapsco White/gray/brown quartz sand interbedded with red, gray, brown clays Fluvial Low ph Iron Manganese Radium 28.7 mgd Patuxent White/gray/orange brown sands and quartz gravels; clay and silt beds 6.8 mgd

9 Aquia aquifer Potomac Group aquifers (Patapsco, Patuxent)

10 Water-level monitoring in Anne Arundel County: Organized into sub-networks Unconfined aquifers Patuxent aquifer Aquia aquifer Miocene aquifers Why so many wells?

11 USGS/MGS Monitoring wells in Anne Arundel County: Aquia (32 wells) Magothy (36) Upper Patapsco (25) Lower Patapsco (27) Patuxent (16) Water-level (Potentiometric-surface) maps: Prepared every other year by MGS and USGS Seven major aquifers in Southern Maryland Illustrate: -- Potentiometric surface -- change in water level (20-30 yrs) Available online Water-level maps for all Coastal Plain aquifers planned for 2014

12 Aquia aquifer Water level declines ft/yr Affected by cone of depression in Calvert and St. Mary s Counties Water age: modern to >30,000 years (AA County)

13 Magothy aquifer Water level declines ft/yr Annapolis, Waldorf cones of depression AA Df 79 Magothy

14 Upper, Lower Patapsco aquifers Annapolis, Waldorf/La Plata cones of depression Water age: modern to 50,000 years (AA County) Crofton Meadows Lower Patapsco aquifer Sandy Point State Park Upper Patapsco aquifer

15 Patuxent aquifer Largest impacts in Charles County, Chalk Point Smaller cones of depression at Dorsey Road, Crofton Meadows AA Cb 1 (Patuxent Wildlife Refuge) Patuxent aquifer

16 Radium

17 Mean daily discharge, in cubic feet per second Groundwater-surface water interaction Example: Sawmill Creek Increased pumpage from Lower Patapsco associated with decreased flow in Sawmill Creek Pumping ceased at Sawmill Well Field in late 1980s; Sawmill Creek baseflow has increased 1, AA Ad 109 Lower Patapsco Sawmill Creek streamgage

18 Aquifers in Ft. Meade area Patuxent aquifer: Unconfined northwest of base; confined beneath base Base production wells screened in Patuxent Arundel Clay provides hydraulic separation from overlying Lower Patapsco

19 Aquifers in Ft. Meade area Lower, upper Patapsco aquifer: Unconfined in vicinity of base; confined to southeast of base Regional flow to southeast Confining unit separating Lower and Upper Patapsco probably leaky Q Lower Patapsco outcrop/contours Upper Patapsco outcrop/contours

20 Aquifers in Ft. Meade area

21 Recent work: Groundwater flow modeling: BRAC model (USGS) -- Update based on of MGS 2007 model -- estimate effects of pumpage on stream baseflow and water level near outcrop area -- child model of regional model Hydrogeology: Monitor wells in Patuxent aquifer (MGS) -- study influence of confined-aquifer pumping in outcrop area -- MGS Administrative Report

22 Contact information: Maryland Geological Survey David Bolton U.S. Geological Survey Jeff Raffensperger

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